<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./vue.js"></script>
    <script src="./lodash.js"></script>
    <style>
        .list-item{
            display: inline-block;
            margin-right: 10px;
            background-color: red;
            border-radius: 50%;
            width: 50px;
            height: 50px;
            text-align: center;
            
            line-height: 50px;
            color: #fff;
        }
        .list-enter-active, .list-leave-active{
            transition: all 1s;
        }
        .list-enter, .list-leave-to{
            opacity: 0;
            transform: translateY(30px);
        }
        .list-move{
            transition: transform 1s;
        }

    </style>
</head>
<body>
    <div id="app">
        <button @click="add">随机插入一个数字</button>
        <button @click="remove">随机移除一个数字</button>
        <button @click="shuffle">洗牌</button>
        <transition-group name="list" tag="p">
            <span v-for="item in items" :key="item" class="list-item">
                {{item}}
            </span>
        </transition-group>
    </div>
    <script>
        var vm = new Vue({
            el:'#app',
            data:{
                items:[1,2,3,4,5],
                nexNum:6
            },
            methods:{
                randomIndex(){
                    return Math.floor(Math.random()*this.items.length)
                },
                add(){
                    this.items.splice(this.randomIndex(),0,this.nexNum++)
                },
                remove(){
                    this.items.splice(this.randomIndex(),1)
                },
                shuffle(){
                    this.items=_.shuffle(this.items)
                }
            }

        })

    </script>

    
</body>
</html>